Fuel pump



April 20, 1948. M. KATICHER 2,440,175

INVENTOR. Mnfr/lsfchef* yBY April 20, 1948. MK/CHER 2,440,175

I INVENToR.

Maf/*lli /Vdcef FIG. 6 BY MM may Patented pr. 20, 1948 UNITED STATESPATENT OFFICE 'FUEL PUMP Morris Katcher, New York, `N. Y. ApplicationJune 21, 1945, Serial No. 600,782

(Cl. K-150) 3 Claims.

This invention relates to a `fuel pump such as are now employed uponautomotive vehicles and elsewhere -in connection with internalcombustion engines. It is an objectof the invention to provide a pump ofsuch construction, that the suction stroke of the pump diaphragm iscaused positively by an operating lever reciprocated by a driving meansforming part of the engine. The operating lever is pivot'edl uponthe'pump at an intermediate portion, the outer "end of the leverengaging the driving means of the engine while the inner yend positivelyengages a diaphragm stem for the suction stroke of the diaphragm.Between vthe inner'end of the lever and the diaphragm is located acompression spring so that the compression stroke oi the diaphragm islimited 'by 'the strength of the compression spring. The spring is ofsuch strength vthat it will not cause more than a predetermined pressurein the discharge ofthe fuel from the pump. It is to be noted that thespring 'reacts between the inner en'd ofthe lever and the diaphragm. Inthe prior art, a spring is used for the compression stroke, but itreacts 'between a iixed portion of the housing 'and the diaphragm.

A further object of the invention is the provision of a readilyattachable bracket or annular flange for attaching the pump housing tothe engine. The operating lever is pivotally mounted on the bracket withits outer end engaging the driving means of the engine and its inner endengaging the diaphragm stem with a lost motion connection. By the useoir such a bracket or brackets with attached operating lever, a pump ofstandard design can be used with different makes of engines, thenecessary variation to suit the diierence in construction of the enginesbeing provided in the brackets and operating levers. At that, theoperating levers between their pivotal axis on the bracket and thediaphragm stem can be kept standard while all the variation is providedbetween said axis and the driving means.

A further object is the provision of an integralsheet metal operatinglever soformed as to engage the springs of the pump, the driving meansvand the diaphragm stem.

Other objects and advantages will become apparent upon further-studyofthe description and drawings, in which Fig. 1 is top plan of the pump.Y

Fig. 2 is a side elevation of the pump, taken along the line 2-'2 ofFig. 1, the forward lever spring and washer being omitted'.

.Fg- 3 is a' plan View of the operating lever and readily attechabieineens er ftreket shown by themselves. y i A Fig. 4 is a iongtudin'aisection rof the pump taken along the line 4--4 of Fig. 1.

Fig. 5 is a side elevation oi the-operating '-lever and `readilyatt'achaiile means orbraoket Kshown by themselves.

Fig. 6 is across section fifths pump-'taken along the line vligt ofF'g.1 and Fig. 7' is a partial section ta-ten along the une of Fig'.

Cover 8 is attached to A'lmirpfc'aLsing 9, bothtoget-hei" forming `thep" p housi" g-'lby 'ne'ans of bolts fm-circular laminated dipineh'edbetween said cover and-saideasie Diaphragm stem "or plunger lflt isattached to' diaphragm il by means of' wasiiers F4, 5, f6 and [landlhead v8`as^i`s"vi'fell known-in tHe art. l"Gfiled about stem 'l2 'isspring l@ 'contacting washer H at its upper end and washer 'ED -at itslower end.

I2 and rests on the top of side piec -I of operaiastem lz near itslower-end and is held therein-by afferc'ed fit. The bottoin offs-15depieoesf 'is' notched out to fit over pin 523. e,

Above diaphragm 'fl 'is'A `24. Dis charge port 25 leads `fromchemisier?y 124 ft outlet 21. Che-ck valve f2s I-ieel across port lispermitting uid :to passfthrolfgh litfrin`- olialoerllt not to return.Such a valveis' iv'll-kiwift'tl art. ribovefva-lve-zs, in @meenemen withport l2'5V air dome 528: lThe 'fhn a'ir'dre isv Well' known Vinji'ho'far't gellsfioi chamber 24 to inlet' por 3 -ischecle'valve 3l liesVaclo's's por't 30, 'periniitn -frltei bowl fsfz toenterj passage ze"tot ne@ te 'ways/fit. valve 31 is similar te Ververs. liquidi fuel inpassing from` bowl-32tb port Bil-pas'sesltlfirogh screen 33in't`o`annular shapedehanel 34, the latter @be-ing in communication port'l. Al`Stop -38 kis provided between inlet' 5'6 arid passage 29to keep the uid'passi-iig frci one to the other. From inist passage 56 the fluid passesdown thrfoll'gllv pais'sa'e- 3`-fft`flter bowl 32', screen 33 'faitpI--I'lll l't'bote tom of passage 35. -Filterbo'wl '32 i's` tlfohe'd tocover -8l by means of' ba1f31, 38 and screw 39. A hook' 'lHVeXtendsf'o'bail 31 irom the bottom o'f screw 39.- By tu fruitA 3'8 on screw 39,hook- 45| can be 'made to 'pr sdow'n on bail' 3T whileA the top* of'flut v38 vplislliV up on bowl 3"-2, pressing the iif thereof iastgasket' 40 Ina-king' aliquid`tiglijt j'oi Operating' leverfZisipivotzllyuntdl oie-"pin 42", the latter passing through side pieces2I of said lever and entering holes provided in lugs 43. Lugs 43 areintegral with mounting bracket 44. Pin 42 has a forced fit with theholes in lugs 43. The outside end of lever 22 is provided with a bridge45 extending between the bottoms of side pieces 2|. Bridge piece 45rides on cam 46 carried by shaft 41, which is usually a part of themotor structure as, for example, the usual valve cam-shaft.

Another bridge 48 extends between the bottoms of side pieces 2| at aboutthe middle of lever 22, that is in the region of its fulcrum. One end ofbridge 48 is bent up at 49 to come between the inner sides of sidepieces 2 I. A tongue 59 extends from end 49 substantially at rightangles thereto.

Washer 5I fits over tongue 59 and receives one Y end of spring 52. Theother end of spring 52 ts over lug 53 formed on pump casing 9. Lugs 43 tinto complementary recesses provided in flange 54 at the outer edge ofcasing 9. Bracket 44, flange 54 and casing i9 are open at 55, Fig. 2, toprovide space for lever 22, washer 5|, tongue 59 and spring 52.

It is the usual practice to attach the pump unit directly by means of aflange, such as flange 54 on casing 9, to the side of a motor casing.Because of the great diiferences with different types and makes ofmotors in the distances and relative positions of the motor and camshaft, many different shaped pump-units are required. In order to reducethe number of different kinds of pump units, the present inventionprovides a standard pump unit or a few standard types of pump units,

the types each having its own standard casing 9 and the operatingmechanism within it. Lugs 43, pin 42 and lever 22 from pin 42 inward toits engagement with diaphragm stem I2 may be kept constant for atype.The variation required to suit diiierent makes of engines for a typewill occur in bracket 44 and in lever 22 between pin 42 and cam 46.

In the prior art it has been the practice to use two levers between cam46 and diaphragm stem I2 for the purpose of producing a positive suctionstroke downward on the sternV and a pressure limited stroke upward fordischarging the fuel fromthe pump. I The upper limit of the pressurethat can be developed is determined by the allowable pressure of thefuel arriving at the carburetor, not shown, it being understood that theinlet of a pump such as shown at 56 is connected to the fuel tank, notshown, and the outlet, such as shown at 21, is connected to thecarburetor. In the present invention, a single operating lever 22 isused, one end of which rides the surface of cam 4G while the other endhas a lost motion connection with the bottom of diaphragm stem I2.

As bridge piece 45 is raisedby cam 46 from its lowest to its highestposition, side pieces 2| press down on pin 23 pulling down diaphragmstem I2 and with it diaphragm I I causing low pressure or suction inchamber 24 dra-wing in fuel from inlet passages 56, 35 and port 30through valve 3|. Now as bridge piece 45, under the iniiuence of spring52,-follows the surface of cam 46 from itsA highest to its lowestposition, side pieces 2| press up on washer compressing spring I9between washers 20 and I1,4 raising stem I2 and forcing diaphragm I'I toflex upwardly with resultant increase of pressure in chamber 24. SpringI9 is m-ade of such strength that when the pressure in the carburetorand in chamber 24 rea-ches a predetermined value, the spring will yieldupon further pressure being applied to it by lever 22 the right end oflever 22, as seen in Fig. 6, about its pivot pin 42.

Bracket 44 is readily att-ached to flange 54 by means of screws 51. Saidbracket is also readily -attached to the engine casing, not shown bymeans of a pair ofbolts, also not shown, which are passed through holes58, or in the case of a different engine by a pair of bolts passedthrough holes 59. It is thus seen that bracket 44 may be made suitablefor more than one make of engine.

I claim:

1. A fuel pump for internal combustion engines A having pump drivingmeans comprising a pump housing adapted to be mounted on an engine, apumping chamber in the housing, a pumping diaphragm within said housingadapted to cooperate with the pumping chamber for effecting the pumping,a stem attached to the diaphragm, a lever pivotally mounted at anintermediate portion on the housing, the outer end of the lever adaptedto engage said driving means to be given a stroke in one direction and aspring reacting at one end against the lever and at the other againstthe housing for giving the lever a stroke in thel opposite direction,said lever being an integral piece of sheetV metal formed into a pair ofspaced substantially vertical side pieces, the outer end of said piecesbeing provided with a transverse bridge joining them and arranged toengage, said driving means and a second bridge joining'said pieces at alocation inward of said former bridge, a tongue extendingas anelongation of the second bridge for engaging the lever end of saidspring, the inner end of the lever engaging the stem with a lost motionconnection.

2. A fuel pump for internal combustion engines having pump driving meanscomprising a pump housing adapted to be mounted Von an engine, 'apumping chamber in the housing, a pumping diaphragm Vwithin the housingadapted to .cooperate with the pumping chamber for ef` fecting thepumping, a stem attached to the diaphragm, a lever pivotally mounted atan intermediate portion on thehousing, the outer end of the leveradapted to engage said driving'means providedin the engine tonbe given astroke in one direction, a spring reacting at one end against the leverand at its other end against the housing forgiving the lever a returnstroke, said lever being an integral piece of sheet metal formed 'into apair of substantially vertical side pieces, the outer endof said piecesbeing provided with a transverse bridge joining them and arranged toengage said driving means, a second transverse bridge engagingY theleverend of the spring and joining said pieces at a location inward fromsaid former bridge, but on the same side of the pivotal Vmounting of thelever as said former bridge, the

inner end of said pieces straddling the stem and positively engaging thelower portion thereof for the stroke of the lever in one direction,vmoving the stem and the diaphragm in one direction, and a spring'reacting between Vsaid inner end and the diaphragm for movingthe stemand daq phragm in the opposite direction from said latter directionduring the opposite stroke of the lever. 3. A pump for internalcombustion engines having pump driving means, comprising a pumpA housingadapted to be mounted on an engine, a pumping chamber in the housing, apumping diaphragm within the housing adapted to cooperate with thepumping chamber for effecting the pumping, a stem attached to thediaphragm, a lever pivotally mounted at an intermediate portion on thehousing, the outer end of the lever.

adapted to engage said driving means to be given a stroke in onedirection, a spring reacting at one end against the lever and at itsother end againstv the housing for giving the lever` a return stroke inthe opposite direction, said lever being an in tegral piece of sheetmetal formed into a pair of substantially vertical side pieces, theouter portion of said pieces being provided with a transverse bridgejoining them and arranged to engage said driving means, a secondtransverse bridge engaging the lever end of the spring joining saidpieces at a location inward of the former bridge,

the inner end of said pieces engaging the stem,

reciprocating the latter as the lever is given its successive strokes.

MORRIS KATCHER.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS

